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AXAF Project Science: CAT Minutes
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AXAF Calibration Analysis Team
1998 June 24 minutes (amended)
ANNOUNCEMENTS:
1 Next telecon is Wednesday, July 08, at 1430 GMT (1030 EDT).
2 See below for revised due dates for Calibration Reports.
3 Access CAT minutes and action items from PS Cal web page (http://wwwastro.msfc.nasa.gov/xraycal/).
4 Closed 2 action items; added 2 NEW action items at 980610 telecon.
5 For full distribution, send E-mail to axaf_cat@alph.msfc.nasa.gov.
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Due dates for Calibration Reports:
MST Jun 24
PS Jul 08
HRC Jul 08
ACIS Jul 15
LETG Jul 29
HETG Jul 29
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Instructions for getting/putting files via anonymous FTP.
Note: Top-level directories are hidden to anonymous users.
> ftp es81-server1.msfc.nasa.gov
Name: anonymous
Password: yourid@yourhost
ftp> cd xrayastronomy
To get files:
ftp> ls (to see files and subdirectories)
ftp> get filename (or mget *)
To put files:
ftp> cd incoming
ftp> put filename (or mput *)
ftp> quit
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RECENTLY CLOSED ACTIONS:
CAT068 MST DONE 980619 HRMA effective area
CAT members require a best value for the HRMA effective area, in order to complete "final" calibration reports.
DONE MST/ Ping Zhou placed the tables, PS files, and their descriptions at http://hea-www.harvard.edu/MST/mirror/www/xrcf/hrma_ea.html (XRCF) and http://hea-www.harvard.edu/MST/mirror/www/orbit/hrma_ea.html (on-orbit).
CAT069 MST DONE 980622 FPC absolute efficiencies
CAT members require best values for HXDS absolute efficiencies, in order to complete "final" calibration reports.
DONE MST/ Dick Edgar placed the currently best-available calibration at http://hea-www.harvard.edu/MST/simul/xrcf/HXDS/index.html under "Quantum Efficiency".
CAT070 MST DONE 980623 HSI efficiency vs energy and pore angle
CAT members require current model for dependence of the HSI efficiency upon energy and pore angle.
DONE MST/ Ian Evans e-mailed to axaf_cat the currently best available HSI efficiency vs. energy and pore angle.
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OLD OPEN ACTIONS:
CAT053 MST Due 980708 Changes in HSI quantum efficiency
During the AXAF calibration activities, charge depletion decreased the gain in the central region of the HSI microchannel plate, resulting in an apparent decrease in quantum efficiency.
OPEN Develop a strategy for approximately correcting the HSI data for changes in quantum efficiency.
CAT057 MST Due 980708 Scattering model
Ray-trace predictions use HDOS surface-profiler metrology to predict scattering.
OPEN Compare surface-metrology scattering predictions with wing-scan data and images; examine effect of differences on effective area and encircled energy. (Need information on possible vignetting by quadrant shutters.)
CAT066 PS Due 980708 Distances for LETG
LETG team requires data on axial positions of sources, LETG, and detectors, relative to HRMA, both at XRCF and in flight.
OPEN HETG/ Dan Dewey provided OTG-specific data at HETG web page. PS will assemble table of distances.
CAT071 ASC Due 980708 HRC-S geometry
LETG finds that ASC-reduced data for the LETG/HRC-S shows an apparent nonlinearity in the dispersion scale. ASC software may use incorrect pixel spacing or tilt for the HRC-S outer segment.
OPEN ASC will examine geometric parameters (gap, tilts, and pixel spacing) and analysis software used for HRC-S, to attempt to identify cause of apparent nonlinearity.
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NEW ACTIONS:
CAT072 MST Due 980708 SSD absolute efficiencies
CAT members require best values for HXDS absolute efficiencies, in order to complete "final" calibration reports.
NEW MST will provide currently best models for SSD absolute efficiencies.
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